Legal solution: Possess a CFP (unacceptable from an ideological standpoint because it is basically a tax on a natural right)
Common-sense solution (for an LEO): don't detain/arrest/prosecute an individual for moving a gun from holster to containment simply because they have technically violated a law while attempting to comply with two or more other laws.
Common-sense solution for the individual: Move the gun from holster to container where you won't be observed. Normally not a problem, but there is always the possibility for unexpected surreptitious observation.
Real-world implications: Somewhere, there is an LEO who will arrest you for this. Its a real, legitimate, legal problem. Every cop I know understands that you are technically breaking the law when (without a Maine or reciprocal out of state CWP) you put a gun into a container, and every cop I know wouldn't think about actually pursuing this. It doesn't mean there isn't someone in their department who wouldn't run with it for whatever reason.
My thinking (personal opinion) is that if someone actually tried to arrest you and press charges for this, they would be laughed out of the courtroom, and if they weren't, you could probably push it at least as far as the state supreme court and secure some form of minor victory for carry rights on state constitutional grounds.
Of course in the meantime you would be out on bail conditions, stripped of your 2A rights, and suffer all the other consequences of trying to live a normal life with criminal charges pending. No one wants to be that guy because, hey, it ******* sucks.